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Trotec TTP 5 E Manual

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7
EXPANSI
O
N
VALVE
Functional
p
rinci
p
le o
f
a com
p
ression re
f
rigeration drye
r
C
OLLE
C
TION
C
ONTAINER
SOLENOID
VALVE
*
HOT
G
AS
DEFROSTIN
G
SYSTE
M
*
Solenoid valve and b
y
pass line onl
y
available
i
n compression re
f
rigeration dr
y
ers with integrated
h
ot gas automatic de
f
rost system
BYPASS*
EVAPORATOR
(COOLING ELEMENT)
FAN
ILLUSTRATI
O
N
©
TROTE
C
CONDENSER
(HEATING ELEMENT)
CO
MPRESS
O
R
Refrigerant circuit
FGJWOKFKƜECVKQP
Refrigerant circuit
FGJWOKFKƜECVKQP
Refrigerant circuit
hot gas defrosting*
Refrigerant circuit
hot gas defrosting*
DAMP AIR DRY AIR
;
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;;
AIR CIRCULATION
DEFROSTING
With this method, defrosting usually takes place
electronically in a time- or sensor-controlle
d
manner by means of air circulation, which i
s
why it is often referred to as electronic or ele
c
-
tric defrosting:
if an increasing amount of ice forms at the evap
-
orator, the compressor switches o and starts
the defrosting process while the fan usually
keeps running and circulates warm room ai
r
around the evaporator to remove the ice
.
This technique has proven itself and work
s
quite well in heated surroundings above ap
-
prox.15 °C
.
If, however, such dryers are used in cooler envi
-
ronments – below 15 °C –, the sur
f
ace tempera
-
ture o
f
the evaporator is below 0 °C. This lead
s
to an intense ice
f
ormation at its sur
f
ace, which
must be de
f
rosted almost permanently in cas
e
o
f
air circulation de
f
rosters as they requir
e
much more time
f
or de
f
rosting.
In co
ld
surroun
d
ings
l
i
k
e t
h
ese, regu
l
ar
d
e
h
u
-
midi
fi
cation becomes nearly impossible wit
h
dehumidi
fi
ers equipped with an air circulation
de
f
rost system as the devices are almost con
-
stantly busy de
f
rosting themselves!
This is why –
f
rom an economic point o
f
view –
re
f
rigerant dryers with an air circulation de
f
rost
system are almost always a good solution
f
o
r
a
ll
operating con
d
itions in warm rooms wit
h
mo
d
erate air temperatures a
b
ove 15 °C.
HOT GAS
DEFROSTING
D
ehumidifiers that are designed to be used in
c
ooler rooms are equipped with a hot gas de
-
f
rost system based on the bypass procedure i
n
-
stead of an air circulation defrost system.
H
ere, the hot refrigerant gas of the compressio
n
c
ircuit is used actively for fast and eective d
e
-
f
rosting. As soon as ice starts to form, a specia
l
solenoid valves opens automatically and red
i
-
r
ects the hot gas from the compressor directly
t
o the evaporator (instead of to the condenser)
via a bypass. The valve closes again after defrost
-
i
ng is completed so that dehumidification oper
-
a
tion can be continued via the regular refriger
-
a
nt
c
ir
cu
it
.
Unlike air circulation de
f
rosting, hot gas auto
-
m
atic de
f
rosting allows
f
or drastically shorter
d
e
f
rost phases o
f
only a
f
ew minutes, which i
s
a
n essential requirement
f
or e
ective dehumi
d
-
ifi
cation in low-temperature surroundings suc
h
a
s unheated rooms. A
f
ter all, the actual deh
u
-
m
idi
fi
cation process only takes place when d
e
-
f
rosting is not in progress!
F
or the dehumidi
fi
cation o
f
unheated rooms at
t
emperatures t
h
at can sometimes
b
e
b
e
l
ow
15 °C, dehumidi
fi
ers with hot gas automatic are
t
here
f
ore always better suited and more e
cient
t
han devices with air circulation de
f
rost
f
unction
d
espite identical compressor per
f
ormance. At tem
-
peratures o
f
more than 15 °C, however, the capacit
y
of
these two dehumidi
fi
er types is increasingly as
-
simi
l
ating unti
l
b
eing virtua
ll
y i
d
entica
l
a
b
ove tem
-
peratures o
f
approx. 18 °C.
TYPES OF DEFROSTING IN COMPRESSION REFRIGERATION DRYERS
A re
f
rigerant compression dryer
opened for servicing shows the
heat exchanger integrated in th
e
upp
er
p
art of the device with th
e
eva
p
orato
r
(1) at the front, on th
e
co
l
d
su
rf
ace
o
f whi
c
h th
e
a
i
r
condenses, and the channe
l
(
2)
behind it serving to discharge th
e
accu
m
u
l
a
t
ed
co
n
de
n
sa
t
e
int
o
th
e
wa
t
e
r
co
ll
ec
ti
o
n
co
nt
a
in
e
r. Th
e
compressor
(3) for the refrigerant is
integrated in the bottom part of th
e
de
v
ice.
C
onclusion: Refrigerant dryers with a hot gas defrost system are versatile all-rounders sinc
e
their defrost system enables operation at ambient temperatures ranging from 5 °C to 35 °C
.
This is wh
y
the devices can be used variabl
y
in warm and cold rooms – both in the summer an
d
in the winter. For process-related reasons, the use of a device with an air circulation defrost sy
s
-
tem, on the other hand, is only reasonable at temperatures between 15 °C and 35 °C from a
n
economic and ener
g
etic
p
oint of view
.
… 7 …


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